Someone who lacks self-awareness about their level of non-conforming interest, passion, or expertise of a subject.

Also: Someone who lacks general self-awareness, hygiene, or sensibility and who simultaneously holds an aberrant level of interest in a subject, often an intellectual or introverted subject. It is a portmanteau of dweeb and nerd.

Guy Fieri is such a dwerd; he is a food nerd and a dweeb with his backwards sunglasses and mafia jewelry.